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    Wyświetlanie 1-6 z 6
    Tytuł:
    Biological Action in and out of the Water Window
    Autorzy:
    Vyšín, L.
    Davídková, M.
    Wachulak, P.
    Fiedorowicz, H.
    Bartnik, A.
    Krůs, M.
    Kozlová, M.
    Skála, J.
    Dostál, J.
    Dudžák, R.
    Juha, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/1029783.pdf
    Data publikacji:
    2018-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    87.14.G-
    52.38.-r
    Opis:
    This study is dealing with the difference of radiation chemical yields of single and double strand breaks induced in plasmid DNA by photons inside and outside of the soft X-ray water window, i.e., in the wavelength range from 2.28 nm to 4.88 nm. Photons were generated by various plasma sources providing nanosecond and sub-nanosecond pulses of extreme ultraviolet, soft X-ray and X-ray radiation. DNA strand breaks were determined by agarose gel electrophoresis. Higher radiation chemical yields of both single and double strand breaks were found using picosecond and nanosecond sources of extreme ultraviolet and X-ray radiation.
    Źródło:
    Acta Physica Polonica A; 2018, 133, 2; 236-238
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A Comparison of Paraxial and Extended Paraxial Approach in Laser Propagation and Second Harmonic Generation
    Autorzy:
    Sharma, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1419745.pdf
    Data publikacji:
    2012-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    52.38.-r
    52.38.Hb
    52.38.Mf
    Opis:
    The propagation of laser beam in the plasma has been investigated for two cases, first with imposing the restriction of paraxial approximation on the beam profile, and second, relaxing the restriction on the profile up to a certain extent. The beam width parameter of the propagating laser beam has been compared for both the cases. Since the off-paraxial part of the beam affects background densities, consequently it will also influence the 2nd harmonic generation. Therefore, comparison of results has been done on the generated second harmonic, in the light of these two cases. A notable change is found in the magnitude of second harmonic yield in modified-paraxial case as compared to the paraxial case.
    Źródło:
    Acta Physica Polonica A; 2012, 122, 1; 122-127
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Applications of a compact "water window" source for investigations of nanostructures using SXR microscope
    Autorzy:
    Torrisi, A.
    Wachulak, P.
    Fahad Nawaz, M.
    Bartnik, A.
    Adjei, D.
    Vondrová, Š.
    Turňová, J.
    Jančarek, A.
    Fiedorowicz, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/1065141.pdf
    Data publikacji:
    2016-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    52.38.-r
    42.30.-d
    42.62.-b
    87.59.-e
    68.37.Yz
    07.85.Tt
    41.50.+h
    42.79.Dj
    Opis:
    A compact soft X-ray microscope based on a nitrogen double-stream gas puff target soft X-ray source, operating at He-like nitrogen spectral line at the wavelength of λ =2.88 nm is presented. The desk-top size microscope was successfully demonstrated in transmission mode using the Fresnel zone-plate objective and it is suitable for soft X-ray source microscopy in the "water window" spectral range (λ = 2.3÷ 4.4 nm). Details about the soft X-ray source source, the microscope and an example of application in the biomedical field are shown and discussed.
    Źródło:
    Acta Physica Polonica A; 2016, 129, 2; 169-171
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    EUV-Induced Nanostructuring of Solids
    Autorzy:
    Bartnik, A.
    Fiedorowicz, H.
    Jarocki, R.
    Kostecki, J.
    Szczurek, A.
    Szczurek, M.
    Wachulak, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1490097.pdf
    Data publikacji:
    2012-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    52.38.Ph
    82.50.Kx
    81.40.Wx
    Opis:
    In this work results of investigations concerning nanostructuring of polymers and some other solids using a laser-plasma extreme ultraviolet source are presented. The plasma radiation was produced using a gas puff target and focused with a gold-plated grazing incidence ellipsoidal collector. Decomposition process of polymers was investigated using a quadrupole mass spectrometer. Different kinds of micro- and nanostructures created in near-surface layers of the materials were investigated using scanning electron microscope. Forms of the structures depend on a particular material and the extreme ultraviolet exposure. In case of some polymers even a single shot is sufficient for creation of the visible changes in surface morphology. In case of inorganic solids visible changes require usually the exposure with tens or hundreds of extreme ultraviolet pulses.
    Źródło:
    Acta Physica Polonica A; 2012, 121, 2; 445-449
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Micro- and Nanoprocessing of Polymers Using a Laser Plasma Extreme Ultraviolet Source
    Autorzy:
    Bartnik, A.
    Fiedorowicz, H.
    Jarocki, R.
    Kostecki, J.
    Rakowski, R.
    Szczurek, A.
    Szczurek, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1539081.pdf
    Data publikacji:
    2010-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    52.38.Ph
    82.50.Kx
    81.40.Wx
    Opis:
    Laser plasma with temperature of the order of tens eV can be an efficient source of extreme ultraviolet (EUV). The radiation can be focused using different kind of optics, giving sufficient fluence for some applications. In this work we present results of investigations concerning applications of a laser plasma EUV source based on a double stream gas puff target. The source was equipped with two different grazing incidence collectors. One of them was a multifoil collector, the second one was an axisymmetrical ellipsoidal collector. The multifoil mirror was used mainly in experiments concerning micromachining of organic polymers by direct photo-etching. The experiments were performed for different polymers that were irradiated through a fine metal grid as a contact mask. The smallest element of a pattern structure obtained in this way was 5 μm, while the structure height was 50 μm giving an aspect ratio about 10. The laser-plasma EUV source equipped with the axisymmetrical ellipsoidal collector was used for surface modification of organic polymers and inorganic solids. The surface morphology after irradiation was investigated. Different forms of micro- and nanostructures were obtained depending on material and irradiation conditions.
    Źródło:
    Acta Physica Polonica A; 2010, 117, 2; 384-390
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Creation of Nanostructures on Polymer Surfaces Irradiated with Extreme Ultraviolet Pulses
    Autorzy:
    Bartnik, A.
    Fiedorowicz, H.
    Jarocki, R.
    Kostecki, J.
    Szczurek, A.
    Szczurek, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1807534.pdf
    Data publikacji:
    2009-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    52.38.Ph
    82.50.Kx
    81.40.Wx
    Opis:
    A laser-plasma extreme ultraviolet source equipped with grazing incidence and Mo/Si collectors was used for surface modification of selected polymers. Surface morphology after irradiation was investigated. Different forms of nanostructures were obtained depending on polymer and irradiation conditions.
    Źródło:
    Acta Physica Polonica A; 2009, 116, S; S-108-S-110
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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